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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_COMPILER_COMPILED_METHOD_H_
#define ART_COMPILER_COMPILED_METHOD_H_
#include <memory>
#include <string>
#include <vector>
#include "arch/instruction_set.h"
#include "base/bit_field.h"
#include "base/bit_utils.h"
namespace art {
template <typename T> class ArrayRef;
class CompiledMethodStorage;
template<typename T> class LengthPrefixedArray;
namespace linker {
class LinkerPatch;
} // namespace linker
class CompiledCode {
public:
// For Quick to supply an code blob
CompiledCode(CompiledMethodStorage* storage,
InstructionSet instruction_set,
const ArrayRef<const uint8_t>& quick_code);
virtual ~CompiledCode();
InstructionSet GetInstructionSet() const {
return GetPackedField<InstructionSetField>();
}
ArrayRef<const uint8_t> GetQuickCode() const;
bool operator==(const CompiledCode& rhs) const;
// To align an offset from a page-aligned value to make it suitable
// for code storage. For example on ARM, to ensure that PC relative
// valu computations work out as expected.
size_t AlignCode(size_t offset) const;
static size_t AlignCode(size_t offset, InstructionSet instruction_set);
// returns the difference between the code address and a usable PC.
// mainly to cope with kThumb2 where the lower bit must be set.
size_t CodeDelta() const;
static size_t CodeDelta(InstructionSet instruction_set);
// Returns a pointer suitable for invoking the code at the argument
// code_pointer address. Mainly to cope with kThumb2 where the
// lower bit must be set to indicate Thumb mode.
static const void* CodePointer(const void* code_pointer, InstructionSet instruction_set);
protected:
static constexpr size_t kInstructionSetFieldSize =
MinimumBitsToStore(static_cast<size_t>(InstructionSet::kLast));
static constexpr size_t kNumberOfCompiledCodePackedBits = kInstructionSetFieldSize;
static constexpr size_t kMaxNumberOfPackedBits = sizeof(uint32_t) * kBitsPerByte;
template <typename T>
static ArrayRef<const T> GetArray(const LengthPrefixedArray<T>* array);
CompiledMethodStorage* GetStorage() {
return storage_;
}
template <typename BitFieldType>
typename BitFieldType::value_type GetPackedField() const {
return BitFieldType::Decode(packed_fields_);
}
template <typename BitFieldType>
void SetPackedField(typename BitFieldType::value_type value) {
DCHECK(IsUint<BitFieldType::size>(static_cast<uintptr_t>(value)));
packed_fields_ = BitFieldType::Update(value, packed_fields_);
}
private:
using InstructionSetField = BitField<InstructionSet, 0u, kInstructionSetFieldSize>;
CompiledMethodStorage* const storage_;
// Used to store the compiled code.
const LengthPrefixedArray<uint8_t>* const quick_code_;
uint32_t packed_fields_;
};
class CompiledMethod final : public CompiledCode {
public:
// Constructs a CompiledMethod.
// Note: Consider using the static allocation methods below that will allocate the CompiledMethod
// in the swap space.
CompiledMethod(CompiledMethodStorage* storage,
InstructionSet instruction_set,
const ArrayRef<const uint8_t>& quick_code,
const ArrayRef<const uint8_t>& vmap_table,
const ArrayRef<const uint8_t>& cfi_info,
const ArrayRef<const linker::LinkerPatch>& patches);
virtual ~CompiledMethod();
static CompiledMethod* SwapAllocCompiledMethod(
CompiledMethodStorage* storage,
InstructionSet instruction_set,
const ArrayRef<const uint8_t>& quick_code,
const ArrayRef<const uint8_t>& vmap_table,
const ArrayRef<const uint8_t>& cfi_info,
const ArrayRef<const linker::LinkerPatch>& patches);
static void ReleaseSwapAllocatedCompiledMethod(CompiledMethodStorage* storage, CompiledMethod* m);
bool IsIntrinsic() const {
return GetPackedField<IsIntrinsicField>();
}
// Marks the compiled method as being generated using an intrinsic codegen.
// Such methods have no relationships to their code items.
// This affects debug information generated at link time.
void MarkAsIntrinsic() {
DCHECK(!IsIntrinsic());
SetPackedField<IsIntrinsicField>(/* value= */ true);
}
ArrayRef<const uint8_t> GetVmapTable() const;
ArrayRef<const uint8_t> GetCFIInfo() const;
ArrayRef<const linker::LinkerPatch> GetPatches() const;
private:
static constexpr size_t kIsIntrinsicLsb = kNumberOfCompiledCodePackedBits;
static constexpr size_t kIsIntrinsicSize = 1u;
static constexpr size_t kNumberOfCompiledMethodPackedBits = kIsIntrinsicLsb + kIsIntrinsicSize;
static_assert(kNumberOfCompiledMethodPackedBits <= CompiledCode::kMaxNumberOfPackedBits,
"Too many packed fields.");
using IsIntrinsicField = BitField<bool, kIsIntrinsicLsb, kIsIntrinsicSize>;
// For quick code, holds code infos which contain stack maps, inline information, and etc.
const LengthPrefixedArray<uint8_t>* const vmap_table_;
// For quick code, a FDE entry for the debug_frame section.
const LengthPrefixedArray<uint8_t>* const cfi_info_;
// For quick code, linker patches needed by the method.
const LengthPrefixedArray<linker::LinkerPatch>* const patches_;
};
} // namespace art
#endif // ART_COMPILER_COMPILED_METHOD_H_
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